Category: 1038-95-5

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Equilibria for the reactions of benzhydryl cations (Ar2CH+) with phosphines, tert-amines, pyridines, and related Lewis bases were determined photometrically in CH2Cl2 and CH3CN solution at 20 C. The measured equilibrium constants can be expressed by the sum of two parameters, defined as the Lewis Acidity (LA) of the benzhydrylium ions and the Lewis basicity (LB) of the phosphines, pyridines, etc. Least-squares minimization of log K = LA + LB with the definition LA = 0 for (4-MeOC6H4)2CH+ gave a Lewis acidity scale for 18 benzhydrylium ions covering 18 orders of magnitude in CH2Cl2 as well as Lewis basicities (with respect to C-centered Lewis acids) for 56 bases. The Lewis acidities correlated linearly with the quantum chemically calculated (B3LYP/6-311++G(3df,2pd)//B3LYP/6-31G(d,p) level) methyl anion affinities of the corresponding benzhydrylium ions, which can be used as reference compounds for characterizing a wide variety of Lewis bases. The equilibrium measurements were complemented by isothermal titration calorimetry studies. Rates of SN1 solvolyses of benzhydryl chlorides, bromides, and tosylates derived from E(13-33)+, i.e., from highly reactive carbocations, correlate excellently with the corresponding Lewis acidities and the quantum chemically calculated methyl anion affinities. This correlation does not hold for solvolyses of derivatives of the better stabilized amino-substituted benzhydrylium ions E(1-12)+. In contrast, the correlation between electrophilic reactivities and Lewis acidities (or methyl anion affinities) is linear for all donor-substituted benzhydrylium ions E(1-21)+, while the acceptor-substituted benzhydrylium ions E(26-33)+ react more slowly than expected from their thermodynamic stabilities. The boundaries of linear rate-equilibrium relationships were thus defined.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Compounds which are inhibitors of cholesterol biosynthesis (by inhibiting de novo squalene biosynthesis), and thus are useful as hypocholesterolemic agents and antiatherosclerotic agents are provided which have the structure STR1 and analogs thereof, wherein R1, R2, R3 and R4 are the same or different and are H, lower alkyl, a metal ion or a prodrug ester; R5 is H, halogen or lower alkyl; Zq is substituted alkenyl, substituted alkynyl, mixed alkenyl-alkynyl or substituted phenylalkyl or, phenylalkenyl or phenylalkynyl, or alkyl, including all stereoisomers thereof. New methods for using such compounds to inhibit cholesterol biosynthesis are also provided.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1038-95-5 is helpful to your research., Synthetic Route of 1038-95-5

Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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The invention relates to substituted phenoxyacetic acids (I) as useful pharmaceutical compounds for treating respiratory disorders, pharmaceutical compositions containing them, and processes for their preparation

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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The present study describes a rapid synthesis method for labeled [11C]FK506 for positron emission tomography (PET). A one-pot reaction from [11C]CH3I, involving a Wittig reaction as the key carbon-carbon bond formation was developed. The chemical process was accomplished using a designed, fully automated synthetic apparatus, and an injectable solution of [11C]FK506 was obtained in only 34 min from [11C]CH3I. The decay-corrected radiochemical yield based on [11C]CH3I was 11.9%, and the specific activity was 39.8 GBq/mumol.

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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article£¬once mentioned of 1038-95-5, Application In Synthesis of Tri-p-tolylphosphine

We herein report a phosphine-mediated domino process of MBH-Type reaction/umpolung gamma-Addition through the rational integration of the privileged reactivities of alkynoate. Simply by manipulating the nucleophilic reagent, the developed protocol offers a facile, diversity-oriented construction of a wide range of three-substituted coumarins.

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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article£¬once mentioned of 1038-95-5, Recommanded Product: 1038-95-5

We report the first example of a silyl-Negishi reaction between secondary zinc organometallics and silicon electrophiles. This palladium-catalyzed process provides direct access to alkyl silanes. The delicate balance of steric and electronic parameters of the employed DrewPhos ligand is paramount to suppressing isomerization and promoting efficient and selective cross-coupling.

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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Reactions of the phosphorus ylide Ph3P=NC(=NPh)Ph (3), conveniently prepared in high yield from Ph3PNLi and ClC(=NPh)Ph, with [Ni(COD)2] in the presence of a tertiary phosphine yielded the complexes [NiPh{Ph2PN=C(NPh)Ph}{NPh[=CPh(N=PPh3)]}] (5) and [NiPh{Ph2PN=C(NPh)Ph}(PR3)] (PR3=PMe3 (6a), PMe2Ph (6b), PMePh2 (6c)) which result from oxidative addition of a P-Ph bond to the Ni(0) centre. When PTol3 was used, only 5 could be isolated, whereas the other phosphines lead to the corresponding complexes 6a-c together with varying amounts of 5 depending on their steric demand. Reaction of the N-methylated phosphorus ylide Ph3P=N-C[=N(o-C6H4)NMe] (1-methyl-2-(triphenylphosphoranylideneamino)benzimidazole (7)) with [Ni(COD)2] in the presence of PTol3 gave the complex [NiPh{Ph2PN=C[N(o-C6H4)NMe]}(PTol3)] (9). No such reaction was observed for the non-methylated analogue Ph3P=N-C[=N(o-C6H4)NH] (2-(triphenylphosphoranylideneamino)benzimidazole (8)), but a dinuclear complex with N,N bridging ligands formulated as [Ni2{Ph3P=N-C[=N(o-C6H4)N]} 4] (10) was formed. Experiments to study the potential of the nickel compounds as catalysts for ethylene oligomerization were disappointing and only the formation of styrene and minor amounts of low molecular weight linear alpha-olefins was observed. The structure of [Ph3P=NC(=NPh)Ph]¡¤HCl (3¡¤HCl) has been determined by X-ray diffraction: monoclinic, space group P21/n, 13.137(3), b=14.942(4), c=13.9444(4) A, beta=90.13(2), V=2737.2A3, Z=4. The structure was solved (direct methods) by using 2209 reflections with I>3sigma (I) out of 6028 unique reflections and refined (full-matrix least-squares) to R(F)=0.048, Rw(F)=0.068.

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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article，once mentioned of 1038-95-5, Recommanded Product: 1038-95-5

Synthesis and biological evaluation of arylphosphonium-benzoxaborole conjugates as novel anticancer agents

Arylphosphonium-benzoxaborole conjugates have been synthesized as potential mitochondria targeting anticancer agents. The synthesized compounds have been tested for their effects on cell viability in various solid tumor cell lines including breast cancer 4T1 and MCF-7, pancreatic cancer MIAPaCa-2 and colorectal adenocarcinoma WiDr. Compound 6c is designated as a lead compound for further studies due to its enhanced effects on cell viability in the above-mentioned cell lines. Seahorse Xfe96 based metabolic assays reveal that the lead candidate 6c inhibits mitochondrial respiration in 4T1 and WiDr cell lines as evidenced by the reduction of mitochondrial ATP production and increase in proton leak. Epiflourescent microscopy experiments also illustrate that 6c causes significant mitochondrial fragmentation in 4T1 and WiDr cells, morphologically consistent with programmed cell death. Our current studies illustrate that arylphosphonium-benzoxaborole conjugates have potential to be further developed as anticancer agents.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 1038-95-5, Product Details of 1038-95-5

Mixed ligand gold(I) complexes of phosphines and thiourea and X-ray structure of (thiourea-kappaS)(tricyclohexylphosphine)gold(I)chloride

A series of mixed ligand gold(I) complexes with thiourea (Tu) and various phosphines, [R3PAuTu]Cl, have been prepared and characterized by elemental analysis, IR and NMR (13C, 15N and 31P) spectroscopies and X-ray crystallography. The spectral data of all complexes are consistent with the sulfur coordination of thiourea to gold(I). The single crystal X-ray structure of the complex [Cy3P-Au-Tu]Cl revealed that the geometry is not perfectly linear at the gold(I) with a P-Au-S bond angle of 168.54(9). The Au-P and Au-S distances are 2.274(2) and 2.295(2) A?, respectively.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Facile alpha-beta isomerisation of the sigma-pi phenylethenyl ligand at the diiron centre

At 110 C alpha-substituted [Fe2(CO)6(n-PhC=CH2)(mu-PPh2)] 1 is cleanly converted into the beta-isomer [Fe2(CO)6(mu-HC=CHPh)(mu-PPh2)] 2, a process which is accelerated in the presence of arylphosphines; with P(OMe)3 mono- and disubstituted adducts of 1 are isolated at 70 C, which cleanly isomerise at higher temperatures.

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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate